This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

This network of narrow, medieval passages has the most delightful name.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

This museum inside a museum tells the story of London's timepieces.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

This historic abandoned train station looks like a stop for ghost trains.

The Bristol Camera Obscura housed in an ancient windmill.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

Regency-era excess on the English Coast.

This charming railway is one of the oldest and steepest funiculars in England.

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

This bronze statue was erected to honor a small Scottish town's beloved stray cat.

One of England's most famous churches hides a pair of little known architectural treasures.

Giant naked man on a hillside.

This beautiful example of Victorian engineering is the oldest water-balanced funicular anywhere in the world.

An American ghost town hides along a side street in Scotland's capital.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Early Medieval stones sit on display at the beautiful Govan Old Church in Glasgow.

A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

The most loyal of little dogs, or a Victorian era publicity stunt?